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  • How to find the number of inversions in an array ?

    - by Michael
    This is an phone interview question: "Find the number of inversions in an array". I guess they mean O(N*log N) solution since O(N^2) is trivial. I guess it cannot be better than O(N*log N) since sorting is O(N*log N) I have checked a similar question from SO and can summarize the answers as follows: Calculate half the distance the elements should be moved to sort the array : copy the array and sort the copy. For each element of the original array a[i] find it's position j in the sorted copy (binary search) and sum abs(i - j)/2. Modify merge sort : modify merge to count inversions between two sorted arrays (it takes O(N)) and run merge sort with the modified merge. Does it make sense ? Are there other (maybe simpler) solution ? Isn't it too hard for a phone interview ?

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  • "Reloading" Bindings in Ninject2?

    - by Michael Stum
    I'm using Ninject2 for DI and I have a Module that loads data from a config file. I wonder if there is a way to tell the Kernel or the Module to reload the config? (I can trigger that through code if needed) What worries me is the lifetime of existing objects. Say I have ITest bound to TestImpl1 in Singleton Scope and I change the config to bind ITest to TestImpl2 instead. All new requests should get TestImpl2, but the classes that already requested TestImpl1 before obviously keep it. However, what if all users of TestImpl1 are gone - will TestImpl1 be properly garbage collected and disposed in case it implements IDisposable? Or will it just be orphaned? Do I have to loop through each type and call Unbind/Bind on it? Or can I just unload the entire Module and reload it while still managing any existing object?

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  • Which class will be instantiated

    - by Michael
    Say I have 2 subclasses from UIViewController, class A and class B. In Main nib file an object is representing class A and it is set to load file from Secondary nib file. The owner of Secondary nib is of class B. The question is - from which class an object in Main nib file will be instanciated once the nib files unarchived in the memory? The reason this question arised is that I have to take care myself if such reference to external NIB file present, to ensure that the first nib's object and second nib's owner is same. Please correct me if my statement is wrong.

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  • Greasemonkey script, that creates Kineticjs drag and drop canvas over every website

    - by Michael Moeller
    I'd like to put a drag and drop canvas over every website I visit in Firefox. My Greasemonkey script puts a drag and drop canvas under every page: kinetic.user.js: // ==UserScript== // @name kineticjs_example // @description Canvas Drag and Drop // @include * // @require http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js // @require http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.7.2.min.js // ==/UserScript== var div = document.createElement( 'div' ); with( div ) { setAttribute( 'id', 'container' ); } // append at end document.getElementsByTagName( 'body' )[ 0 ].appendChild( div ); var stage = new Kinetic.Stage({ container: 'container', width: 1000, height: 1000 }); var layer = new Kinetic.Layer(); var rectX = stage.getWidth() / 2 - 50; var rectY = stage.getHeight() / 2 - 25; var box = new Kinetic.Rect({ x: rectX, y: rectY, width: 100, height: 50, fill: '#00D2FF', stroke: 'black', strokeWidth: 4, draggable: true }); // add cursor styling box.on('mouseover', function() { document.body.style.cursor = 'pointer'; }); box.on('mouseout', function() { document.body.style.cursor = 'default'; }); layer.add(box); stage.add(layer); How can I drag and drop this shape over the entire website?

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  • Windows Forms Unhandled-Exception Dialog

    - by Michael
    I want to get Default Windows Forms Unhandled-Exception Dialog whenever my C# application encounters U-E. In vs 2005 when I turn off jit Debugging in app.conf like this: <configuration> <system.windows.forms jitDebugging="false" /> <configuration> the application behaves correctly and shows Windows Forms U-E default dialog, with Continue, Quit, call stack and all. However in vs 2008, on the same machine or different, even though I diable jit I still get Default .NET Unhandled-Exception Dialog, with Debug, Send Report and Don't Send buttons. How can I make my vs 2008 app act like the one I make in vs 2005, to show Windows Forms U-E dialog box? Please do not recommend to use AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); just because I don't use custom handler in my vs 2005 project, why would I use in vs 2008? I want to let this job do CLR. Any help is appreciated

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  • How can I pass a C++ member function to a C API as a parameter

    - by michael
    Hi, In my C++ program, I need to call this c API: GConn* gnet_conn_new (const gchar *hostname, gint port, GConnFunc func); where GConnFunc is defined as: void (*GConnFunc) (GConn *conn); My question is if I have a C++ class and have a member function like Class A { public: A(); void my_func (GConn* conn); } In my A::A() Constructor, how can I pass this-myfunc to gnet_conn_new as the GConnFunc parameter? Thank you.

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  • Equal Height Columns with Cross-Browser CSS

    - by Frank Michael Kraft
    I want to have divs of the same height. http://matthewjamestaylor.com/blog/equal-height-columns-cross-browser-css-no-hacks does not work for be because my divs have a border, and the method described assumes, that they have not. A jQuery solution I could not make work, because my divs resize late because of ajax and menu clicks and I can not find an event for this.

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  • Show or hide fields depending on the Acl9 role - Ruby on Rails

    - by Michaël
    Hi, I am using Acl9 to manage the roles and I want to hide the checkbox usertype if the user has the role :customer and show it if the role is :manager. I want that just the :manager can edit all the fields and some for the :customer. Thank you for your help! <h1>Editing user</h1> <% form_for(@user) do |f| %> <%= f.error_messages %> <p> <%= f.label :usertype %><br /> <%= f.check_box :usertype %> </p> <p> <%= f.label :surname %><br /> <%= f.text_field :surname %> </p> <p> <%= f.label :firstname %><br /> <%= f.text_field :firstname %> </p> <p> <%= f.label :phone %><br /> <%= f.text_field :phone %> </p> <p> <%= f.label :email %><br /> <%= f.text_field :email %> </p> <p> <%= f.label :registrationdate %><br /> <%= f.datetime_select :registrationdate %> </p> <p> <%= f.label :login %><br /> <%= f.text_field :login %> </p> <p> <%= f.label :password %><br /> <%= f.text_field :password %> </p> <p> <%= f.submit 'Update' %> </p> <% end %> <%= link_to 'Show', @user %> | <%= link_to 'Back', users_path %>

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  • Is my Perl script grabbing environment variabless from "someplace else"?

    - by Michael Wilson
    On a Solaris box in a "mysterious production system" I'm running a Perl script that references an environment variable. No big deal. The contents of that variable from the shell both pre- and post-execution are what I expect. However, when reported by the script, it appears as though it's running in some other sub-shell which is clobbering my vars with different values for the duration of the script. Unfortunately I really can't paste the code. I'm trying to get an atomic case, but I'm at my wit's end here.

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  • XUL: create menu items dynamically and set "selected" attr

    - by Michael
    I have a firefox extension Options pref panel, where I should dynamically create menu items and select particular item to be current. here is the XUL file part <menulist id="rss_service_combo"> <menupopup id="rss_service_menu"/> </menulist> Then in load event of the pref panel, using js I append menuitem elements into menupop. This is working fine. The only problem is that even if I set the selected element the item is not selected and combo box is initially empty. The only way is working at the moment is if I manually add those menuitems into XUL file and set selected attribute, but I need to do it dynamically.

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  • Adding a web address to a <a href="value">

    - by Michael Robinson
    I have an upload script that write a index.html file, I modified it to mail me the results, however the point to the root, since the email isn't in the root, the image doesn't load. How do I append the code to add "http://www.home.html/uploaded" prior to the ". $value ." so that the images show up in the email. Here is portion of PHP that assigns the images to a $result: // Process value of Imagedata field, this is JPEG-files array foreach ($_FILES[Imagedata][name] as $key => $value) { $uploadfile = $destination_dir . basename($_FILES[Imagedata][name][$key]); if (move_uploaded_file($_FILES['Imagedata']['tmp_name'][$key], $uploadfile)) { $result .= "File uploaded: <a href='". $value . "'>" . $value . "</a><br>"; } } // $result .= "<br>"; Here is what I'm now receiving in the email, : <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Upload results</title> </head> <body> AdditionalStringVariable: pass additional data here<br><a> href='gallery_grannylovesthis_l.jpg'><img border = '0' src='QIU_thumb_gallery_grannylovesthis_l.jpg'/></a><br><br><br>File uploaded: <a href='gallery_grannylovesthis_l.jpg'>gallery_grannylovesthis_l.jpg</a><br><br> GlobalControlData: PHOTO_VISIBILITY : 2<br> GlobalControlData: PHOTO_DESCR : Requiredtest<br> GlobalControlData: PHOTO_TITLE : Requiredtest<br><br>gallery_grannylovesthis_l.png<br> control: , value: <br> </body> </html> Thanks in advance for any guidance...I have a feeling it's something simple.

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  • How can I remove my last commit in my local git repository

    - by michael
    Hi, This is the output of my 'git log'. But when I do a 'git pull' , the top commit causes conflict. So I did a 'git rebase -abort' commit 7826b25db424b95bae9105027edb7dcbf94d6e65 commit 5d1970105e8fd2c7b30c232661b93f1bcd00bc96 But my question is Can I 'save' my commit to a patch and then do a git pull? Just like I want to emulate * I did not do a git commit, but I did a 'git stash' instead * Do a git pull so that I should not get any merge error So I need to somehow 'turn back the clock'. Is that possible in git?

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  • Looking for a good C++/.net book

    - by Michael Minerva
    I have recently started to feel that I need to greatly improve my C++ skills especially in the realm of .net. I graduated from a good four year university with a degree in computer science about 9 months ago and I have since been doing full time contract work for a small software company in my local area. Most of my work has been done using Java/lisp/cocoa/XML and before that most of my programming in my senior year was in java/C#. I did a decent amount of C++ in my Sophomore year and in my free time before that but I feel that my general knowledge of C++/.net is very lacking for the opportunities that are now coming my way. Can anyone recommend a good book that could help me get up too speed? I feel I do not need a very basic introduction to C++ but something that covers the fundamentals of .net would be good for me. So basically what I need is a book or books that would be good for a .net novice and a C++ developer who is just beyond novice. Also, a book that would help bein an interview by giving me a conversional understanding of C++ would be great. Thanks a lot!.

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  • Python NameError when attempting to use a user-defined class

    - by Michael Herold
    I'm getting a weird instance of a NameError when attempting to use a class I wrote. In a directory, I have the following file structure: dir/ ReutersParser.py test.py reut-xxx.sgm Where my custom class is defined in ReutersParser.py and I have a test script defined in test.py. The ReutersParser looks something like this: from sgmllib import SGMLParser class ReutersParser(SGMLParser): def __init__(self, verbose=0): SGMLParser.__init__(self, verbose) ... rest of parser if __name__ == '__main__': f = open('reut2-short.sgm') s = f.read() p = ReutersParser() p.parse(s) It's a parser to deal with SGML files of Reuters articles. The test works perfectly. Anyway, I'm going to use it in test.py, which looks like this: from ReutersParser import ReutersParser def main(): parser = ReutersParser() if __name__ == '__main__': main() When it gets to that parser line, I'm getting this error: Traceback (most recent call last): File "D:\Projects\Reuters\test.py", line 34, in <module> main() File "D:\Projects\Reuters\test.py", line 19, in main parser = ReutersParser() File "D:\Projects\Reuters\ReutersParser.py", line 38, in __init__ SGMLParser.__init__(self, verbose) NameError: global name 'sgmllib' is not defined For some reason, when I try to use my ReutersParser in test.py, it throws an error that says it cannot find sgmllib, which is a built-in module. I'm at my wits' end trying to figure out why the import won't work. What's causing this NameError? I've tried importing sgmllib in my test.py and that works, so I don't understand why it can't find it when trying to run the constructor for my ReutersParser.

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  • Make the Enter key act like the submit button

    - by Michael Quiles
    How can I make it where some one presses the enter key on my form it will submit this code ? Ive tried the ligtning bolt events etc... but I can't seem to figure it out. private void xTripSubmitButton_Click(object sender, EventArgs e) { // Calculates the numbers from the input and output boxes/labels Miles = double.Parse(this.xTripDestinationTextBox.Text); Mpg = double.Parse(this.xTripMpgTextBox.Text); Price = double.Parse(this.xTripPricepgTextBox.Text); Output = Miles / Mpg; Coutput = Output * Price; //displays a message and the result for the numbers the user inputs this.xTripOutputLabel.Text = "Total gallons you would use: " + Output.ToString("0") + Environment.NewLine + "Total amount it will cost you: " + Coutput.ToString("C"); }

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  • Grails: can remoteField update multiple fields?

    - by Michael Bavin
    Hi, Assume i have a book entity with an isbn field. When entered a isbn number, i want 2 fields to be updated: title and author. My controller looks like this: def ajaxGetBook = { def book = Book.findByIsbn(params.isbn) if(book==null) book = new Book() render book as JSON } So my call works, and i get a full JSON Book. Now i would like to update 2 texfields by the update attribute <g:remoteField action="ajaxGetBook" update="title" name="isbn" value="${bookInstance?.book?.isbn}" paramName="isbn"/> Now the title field gets updated with the full book object, so that doesn't work. Is it possible to update field title with only the JSON book.title? Is it possible to update more fields at once? I could render book.title as JSON but that works for only one field. Thank you

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  • Creating a "virtual" path (/bla) in Mac OS X and Linux that calls custom code

    - by Michael Stum
    Just something I'd like to play with, I would like to create a "virtual" file/directory in the File System of Linux or Mac OS X (Not sure if I can share the same code - does POSIX help?), for example /foo and then perform custom code when something is read or written to it. Similar how /dev/null allows for stuff like echo "Hello!" > /dev/null I don't care if it's in /dev, /proc or anywhere else, as said it's mainly something to play with...

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  • How to discover getters and setters on hibernate objects

    - by Michael Jones
    I need to find a way of taking a hibernate object and discovering at runtime all of the getter methods that relate to persistable fields. I'm using annotations in the classes but have previously had difficulties working with them (I ran into a 2 year old bug the java developers still haven't fixed). Does anyone know how I can do this please, ideally without using annotations? Thanks. PS - What I'm trying to do here is to update a new object with values from an existing object dynamically.

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  • Python Threading, loading one thread after another

    - by Michael
    Hi, I'm working on a media player and am able to load in a single .wav and play it. As seen in the code below. foo = wx.FileDialog(self, message="Open a .wav file...", defaultDir=os.getcwd(), defaultFile="", style=wx.FD_MULTIPLE) foo.ShowModal() queue = foo.GetPaths() self.playing_thread = threading.Thread(target=self.playFile, args=(queue[0], 'msg')) self.playing_thread.start() But the problem is, when I try to make the above code into a loop for multiple .wav files. Such that while playing_thread.isActive == True, create and .start() the thread. Then if .isActive == False, pop queue[0] and load the next .wav file. Problem is, my UI will lock up and I'll have to terminate the program. Any ideas would be appreciated.

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